Simple examples

Weekly until fixed date

 [1] "1997-09-02"
 [2] "1997-09-09"
 [3] "1997-09-16"
 [4] "1997-09-23"
 [5] "1997-09-30"
 [6] "1997-10-07"
 [7] "1997-10-14"
 [8] "1997-10-21"
 [9] "1997-10-28"
[10] "1997-11-04"
[11] "1997-11-11"
[12] "1997-11-18"
[13] "1997-11-25"
[14] "1997-12-02"
[15] "1997-12-09"
[16] "1997-12-16"
[17] "1997-12-23"

Weekly until December 24, 1997

Every other week

 [1] "1997-09-02"
 [2] "1997-09-16"
 [3] "1997-09-30"
 [4] "1997-10-14"
 [5] "1997-10-28"
 [6] "1997-11-11"
 [7] "1997-11-25"
 [8] "1997-12-09"
 [9] "1997-12-23"
[10] "1998-01-06"
[11] "1998-01-20"
[12] "1998-02-03"
[13] "1998-02-17"
[14] "1998-03-03"
[15] "1998-03-17"
[16] "1998-03-31"
[17] "1998-04-14"
[18] "1998-04-28"
[19] "1998-05-12"
[20] "1998-05-26"
[21] "1998-06-09"
[22] "1998-06-23"
[23] "1998-07-07"
[24] "1998-07-21"
[25] "1998-08-04"
[26] "1998-08-18"
[27] "1998-09-01"
[28] "1998-09-15"
[29] "1998-09-29"
[30] "1998-10-13"
[31] "1998-10-27"
[32] "1998-11-10"
[33] "1998-11-24"
[34] "1998-12-08"
[35] "1998-12-22"

Every other week - forever:

Advanced examples

Weekly on Tuesday and Thursday for five weeks:

 [1] "1997-09-02"
 [2] "1997-09-04"
 [3] "1997-09-09"
 [4] "1997-09-11"
 [5] "1997-09-16"
 [6] "1997-09-18"
 [7] "1997-09-23"
 [8] "1997-09-25"
 [9] "1997-09-30"
[10] "1997-10-02"
[11] "1997-10-07"

Every other week on Monday, Wednesday, and Friday

 [1] "1997-09-01"
 [2] "1997-09-02"
 [3] "1997-09-10"
 [4] "1997-09-11"
 [5] "1997-09-12"
 [6] "1997-09-13"
 [7] "1997-09-14"
 [8] "1997-09-15"
 [9] "1997-09-16"
[10] "1997-09-24"
[11] "1997-09-25"
[12] "1997-09-26"
[13] "1997-09-27"
[14] "1997-09-28"
[15] "1997-09-29"
[16] "1997-09-30"
[17] "1997-10-08"
[18] "1997-10-09"
[19] "1997-10-10"
[20] "1997-10-11"
[21] "1997-10-12"
[22] "1997-10-13"
[23] "1997-10-14"
[24] "1997-10-22"
[25] "1997-10-23"
[26] "1997-10-24"
[27] "1997-10-25"
[28] "1997-10-26"
[29] "1997-10-27"
[30] "1997-10-28"
[31] "1997-11-05"
[32] "1997-11-06"
[33] "1997-11-07"
[34] "1997-11-08"
[35] "1997-11-09"
[36] "1997-11-10"
[37] "1997-11-11"
[38] "1997-11-19"
[39] "1997-11-20"
[40] "1997-11-21"
[41] "1997-11-22"
[42] "1997-11-23"
[43] "1997-11-24"
[44] "1997-11-25"
[45] "1997-12-03"
[46] "1997-12-04"
[47] "1997-12-05"
[48] "1997-12-06"
[49] "1997-12-07"
[50] "1997-12-08"
[51] "1997-12-09"
[52] "1997-12-17"
[53] "1997-12-18"
[54] "1997-12-19"
[55] "1997-12-20"
[56] "1997-12-21"
[57] "1997-12-22"
[58] "1997-12-23"

Holidays

U.S. Independence Day

[1] "2020-07-04"
[2] "2021-07-04"
[3] "2022-07-04"
[4] "2023-07-04"
[5] "2024-07-04"
[6] "2025-07-04"

In the United States Independence Day is celebrated on.

Martin Luther King Jr. Day

[1] "2020-01-20"
[2] "2021-01-18"
[3] "2022-01-17"
[4] "2023-01-16"
[5] "2024-01-15"
[6] "2025-01-20"

Martin Luther King Jr. Day is a national holiday United States occuring every year on the third Monday in January.

This means Martin Luther King Day is a apparently complicated schedule. But, if using gs, even apparently complicated schedules can easily be created from simple building blocks.

In the first section of code, we create the component schedules.